fix issue of jumping to address 0

test/Makefile

@@ -16,8 +16,8 @@ LDFLAGS = -T test.ld
 %.o: %.c
 	$(CC) $(CFLAGS) $^ -o $@
 
-%.elf: %.o
-	$(LD) $(LDFLAGS) $^ -o $@
+%.elf: %.o %.ld
+	$(LD) $(LDFLAGS) $< -o $@
 
 text.hex: test.elf
 	riscv64-linux-gnu-objdump -s $^ | sed -n '/.text/,$$p' | tail -n+2 | sed -n '/.data/,$$!p' | cut -f3-6 -d ' ' | sed -e 's/ /\n/g' | sed 's/^\(..\)\(..\)\(..\)\(..\)/\4\3\2\1/' > $@